Trailer here.
The film begins with two people running through the forest covered in blood. A car is following them. They both get killed by someone. A man called Jason(Askwith) wants to have a break. He sees an advertisement for a holiday. The company is called Hairy Holidays. He calls to their office to arrange it. He meets a man called Mr. Pollack(Dennis Price) who fills him in on the details. He gets the train down to the countryside. He meets a girl on the train called Judy(Vanessa Shaw). It just happens that she is also going to the same holiday home. The place is called Brittlehurst Manor. It is less holiday home and more health farm. There is a sinister person called Dr. Storm(Gough) who looks very strange indeed. He runs the place. He sends a man called Frederick to meet them. Judy meets Aunt Harris there. Her aunt doesn't want Judy there. Why??